Q. A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

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Q. A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

Q. A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

  1. Low refractive index
  2. Absence of sugar
  3. Acidic
  4. Alkaline

Solution :

Correct option : D Phloem sap is generally alkaline with pH ranging from 7.3 – 8.5 and contains high levels of K+ and Mg2+. Hence, the chemical test for alkalinity will help to identify that the exudated sap is phloem sap. So, the correct answer is ‘Alkaline’.

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